The BRK Electronics® Cat. No. 83RN is a battery operated single station smoke alarm specifically designed for residential and institutional applications including sleeping rooms of hospitals, hotels, motels, dormitories and other multi-family dwellings as defined in standard NFPA 101. The 83RN is approved for RV use. Complies with UL217, CSFM, NFPA 72, HUD, FHA and other agencies that model their codes after the above agencies. BRK Electronics® catalog number 83RN features a fully insect screened dual ionization smoke sensing chamber, an 85dB horn, a supervised 9V battery power supply, a full function test switch, a red LED light that indicates DC power or alarm. The compact, low profile design complements any décor. Battery installation and removal can occur while the unit is mounted to the ceiling or wall via the hinged cover. When voltage drops to a pre-set warning level, the 83RN's horn will "chirp" approximately once per minute to indicate a fresh battery is needed. To insure the battery is always replaced properly, the cover is designed to resist closing when the battery is missing. Designed for surface mounting, the 83RN includes mounting anchors and screws.